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path: root/drivers/media/i2c/tda7432.c
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Diffstat (limited to 'drivers/media/i2c/tda7432.c')
-rw-r--r--drivers/media/i2c/tda7432.c485
1 files changed, 485 insertions, 0 deletions
diff --git a/drivers/media/i2c/tda7432.c b/drivers/media/i2c/tda7432.c
new file mode 100644
index 000000000000..f7707e65761e
--- /dev/null
+++ b/drivers/media/i2c/tda7432.c
@@ -0,0 +1,485 @@
+/*
+ * For the STS-Thompson TDA7432 audio processor chip
+ *
+ * Handles audio functions: volume, balance, tone, loudness
+ * This driver will not complain if used with any
+ * other i2c device with the same address.
+ *
+ * Muting and tone control by Jonathan Isom <jisom@ematic.com>
+ *
+ * Copyright (c) 2000 Eric Sandeen <eric_sandeen@bigfoot.com>
+ * Copyright (c) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>
+ * This code is placed under the terms of the GNU General Public License
+ * Based on tda9855.c by Steve VanDeBogart (vandebo@uclink.berkeley.edu)
+ * Which was based on tda8425.c by Greg Alexander (c) 1998
+ *
+ * OPTIONS:
+ * debug - set to 1 if you'd like to see debug messages
+ * set to 2 if you'd like to be inundated with debug messages
+ *
+ * loudness - set between 0 and 15 for varying degrees of loudness effect
+ *
+ * maxvol - set maximium volume to +20db (1), default is 0db(0)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+#include <linux/i2c.h>
+
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/i2c-addr.h>
+
+#ifndef VIDEO_AUDIO_BALANCE
+# define VIDEO_AUDIO_BALANCE 32
+#endif
+
+MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
+MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
+MODULE_LICENSE("GPL");
+
+static int maxvol;
+static int loudness; /* disable loudness by default */
+static int debug; /* insmod parameter */
+module_param(debug, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Set debugging level from 0 to 3. Default is off(0).");
+module_param(loudness, int, S_IRUGO);
+MODULE_PARM_DESC(loudness, "Turn loudness on(1) else off(0). Default is off(0).");
+module_param(maxvol, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(maxvol, "Set maximium volume to +20dB(0) else +0dB(1). Default is +20dB(0).");
+
+
+/* Structure of address and subaddresses for the tda7432 */
+
+struct tda7432 {
+ struct v4l2_subdev sd;
+ int addr;
+ int input;
+ int volume;
+ int muted;
+ int bass, treble;
+ int lf, lr, rf, rr;
+ int loud;
+};
+
+static inline struct tda7432 *to_state(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct tda7432, sd);
+}
+
+/* The TDA7432 is made by STS-Thompson
+ * http://www.st.com
+ * http://us.st.com/stonline/books/pdf/docs/4056.pdf
+ *
+ * TDA7432: I2C-bus controlled basic audio processor
+ *
+ * The TDA7432 controls basic audio functions like volume, balance,
+ * and tone control (including loudness). It also has four channel
+ * output (for front and rear). Since most vidcap cards probably
+ * don't have 4 channel output, this driver will set front & rear
+ * together (no independent control).
+ */
+
+ /* Subaddresses for TDA7432 */
+
+#define TDA7432_IN 0x00 /* Input select */
+#define TDA7432_VL 0x01 /* Volume */
+#define TDA7432_TN 0x02 /* Bass, Treble (Tone) */
+#define TDA7432_LF 0x03 /* Attenuation LF (Left Front) */
+#define TDA7432_LR 0x04 /* Attenuation LR (Left Rear) */
+#define TDA7432_RF 0x05 /* Attenuation RF (Right Front) */
+#define TDA7432_RR 0x06 /* Attenuation RR (Right Rear) */
+#define TDA7432_LD 0x07 /* Loudness */
+
+
+ /* Masks for bits in TDA7432 subaddresses */
+
+/* Many of these not used - just for documentation */
+
+/* Subaddress 0x00 - Input selection and bass control */
+
+/* Bits 0,1,2 control input:
+ * 0x00 - Stereo input
+ * 0x02 - Mono input
+ * 0x03 - Mute (Using Attenuators Plays better with modules)
+ * Mono probably isn't used - I'm guessing only the stereo
+ * input is connected on most cards, so we'll set it to stereo.
+ *
+ * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
+ * Bit 4 controls bass range: 0/1 is extended/standard bass range
+ *
+ * Highest 3 bits not used
+ */
+
+#define TDA7432_STEREO_IN 0
+#define TDA7432_MONO_IN 2 /* Probably won't be used */
+#define TDA7432_BASS_SYM 1 << 3
+#define TDA7432_BASS_NORM 1 << 4
+
+/* Subaddress 0x01 - Volume */
+
+/* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
+ * Recommended maximum is +20 dB
+ *
+ * +32dB: 0x00
+ * +20dB: 0x0c
+ * 0dB: 0x20
+ * -79dB: 0x6f
+ *
+ * MSB (bit 7) controls loudness: 1/0 is loudness on/off
+ */
+
+#define TDA7432_VOL_0DB 0x20
+#define TDA7432_LD_ON 1 << 7
+
+
+/* Subaddress 0x02 - Tone control */
+
+/* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
+ * 0x0 is 14dB, 0x7 is 0dB
+ *
+ * Bit 3 controls treble attenuation/gain (sign)
+ * 1 = gain (+)
+ * 0 = attenuation (-)
+ *
+ * Bits 4,5,6 control absolute bass gain from 0dB to 14dB
+ * (This is only true for normal base range, set in 0x00)
+ * 0x0 << 4 is 14dB, 0x7 is 0dB
+ *
+ * Bit 7 controls bass attenuation/gain (sign)
+ * 1 << 7 = gain (+)
+ * 0 << 7 = attenuation (-)
+ *
+ * Example:
+ * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
+ */
+
+#define TDA7432_TREBLE_0DB 0xf
+#define TDA7432_TREBLE 7
+#define TDA7432_TREBLE_GAIN 1 << 3
+#define TDA7432_BASS_0DB 0xf
+#define TDA7432_BASS 7 << 4
+#define TDA7432_BASS_GAIN 1 << 7
+
+
+/* Subaddress 0x03 - Left Front attenuation */
+/* Subaddress 0x04 - Left Rear attenuation */
+/* Subaddress 0x05 - Right Front attenuation */
+/* Subaddress 0x06 - Right Rear attenuation */
+
+/* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
+ * in 1.5dB steps.
+ *
+ * 0x00 is 0dB
+ * 0x1f is -37.5dB
+ *
+ * Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
+ * We'll use the mute on the input, though (above)
+ * Bits 6,7 unused
+ */
+
+#define TDA7432_ATTEN_0DB 0x00
+#define TDA7432_MUTE 0x1 << 5
+
+
+/* Subaddress 0x07 - Loudness Control */
+
+/* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
+ * when bit 4 is NOT set
+ *
+ * 0x0 is 0dB
+ * 0xf is -15dB
+ *
+ * If bit 4 is set, then there is a flat attenuation according to
+ * the lower 4 bits, as above.
+ *
+ * Bits 5,6,7 unused
+ */
+
+
+
+/* Begin code */
+
+static int tda7432_write(struct v4l2_subdev *sd, int subaddr, int val)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ unsigned char buffer[2];
+
+ v4l2_dbg(2, debug, sd, "In tda7432_write\n");
+ v4l2_dbg(1, debug, sd, "Writing %d 0x%x\n", subaddr, val);
+ buffer[0] = subaddr;
+ buffer[1] = val;
+ if (2 != i2c_master_send(client, buffer, 2)) {
+ v4l2_err(sd, "I/O error, trying (write %d 0x%x)\n",
+ subaddr, val);
+ return -1;
+ }
+ return 0;
+}
+
+static int tda7432_set(struct v4l2_subdev *sd)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct tda7432 *t = to_state(sd);
+ unsigned char buf[16];
+
+ v4l2_dbg(1, debug, sd,
+ "tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
+ t->input, t->volume, t->bass, t->treble, t->lf, t->lr,
+ t->rf, t->rr, t->loud);
+ buf[0] = TDA7432_IN;
+ buf[1] = t->input;
+ buf[2] = t->volume;
+ buf[3] = t->bass;
+ buf[4] = t->treble;
+ buf[5] = t->lf;
+ buf[6] = t->lr;
+ buf[7] = t->rf;
+ buf[8] = t->rr;
+ buf[9] = t->loud;
+ if (10 != i2c_master_send(client, buf, 10)) {
+ v4l2_err(sd, "I/O error, trying tda7432_set\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static void do_tda7432_init(struct v4l2_subdev *sd)
+{
+ struct tda7432 *t = to_state(sd);
+
+ v4l2_dbg(2, debug, sd, "In tda7432_init\n");
+
+ t->input = TDA7432_STEREO_IN | /* Main (stereo) input */
+ TDA7432_BASS_SYM | /* Symmetric bass cut */
+ TDA7432_BASS_NORM; /* Normal bass range */
+ t->volume = 0x3b ; /* -27dB Volume */
+ if (loudness) /* Turn loudness on? */
+ t->volume |= TDA7432_LD_ON;
+ t->muted = 1;
+ t->treble = TDA7432_TREBLE_0DB; /* 0dB Treble */
+ t->bass = TDA7432_BASS_0DB; /* 0dB Bass */
+ t->lf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
+ t->lr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
+ t->rf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
+ t->rr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
+ t->loud = loudness; /* insmod parameter */
+
+ tda7432_set(sd);
+}
+
+static int tda7432_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
+{
+ struct tda7432 *t = to_state(sd);
+
+ switch (ctrl->id) {
+ case V4L2_CID_AUDIO_MUTE:
+ ctrl->value=t->muted;
+ return 0;
+ case V4L2_CID_AUDIO_VOLUME:
+ if (!maxvol){ /* max +20db */
+ ctrl->value = ( 0x6f - (t->volume & 0x7F) ) * 630;
+ } else { /* max 0db */
+ ctrl->value = ( 0x6f - (t->volume & 0x7F) ) * 829;
+ }
+ return 0;
+ case V4L2_CID_AUDIO_BALANCE:
+ {
+ if ( (t->lf) < (t->rf) )
+ /* right is attenuated, balance shifted left */
+ ctrl->value = (32768 - 1057*(t->rf));
+ else
+ /* left is attenuated, balance shifted right */
+ ctrl->value = (32768 + 1057*(t->lf));
+ return 0;
+ }
+ case V4L2_CID_AUDIO_BASS:
+ {
+ /* Bass/treble 4 bits each */
+ int bass=t->bass;
+ if(bass >= 0x8)
+ bass = ~(bass - 0x8) & 0xf;
+ ctrl->value = (bass << 12)+(bass << 8)+(bass << 4)+(bass);
+ return 0;
+ }
+ case V4L2_CID_AUDIO_TREBLE:
+ {
+ int treble=t->treble;
+ if(treble >= 0x8)
+ treble = ~(treble - 0x8) & 0xf;
+ ctrl->value = (treble << 12)+(treble << 8)+(treble << 4)+(treble);
+ return 0;
+ }
+ }
+ return -EINVAL;
+}
+
+static int tda7432_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
+{
+ struct tda7432 *t = to_state(sd);
+
+ switch (ctrl->id) {
+ case V4L2_CID_AUDIO_MUTE:
+ t->muted=ctrl->value;
+ break;
+ case V4L2_CID_AUDIO_VOLUME:
+ if(!maxvol){ /* max +20db */
+ t->volume = 0x6f - ((ctrl->value)/630);
+ } else { /* max 0db */
+ t->volume = 0x6f - ((ctrl->value)/829);
+ }
+ if (loudness) /* Turn on the loudness bit */
+ t->volume |= TDA7432_LD_ON;
+
+ tda7432_write(sd, TDA7432_VL, t->volume);
+ return 0;
+ case V4L2_CID_AUDIO_BALANCE:
+ if (ctrl->value < 32768) {
+ /* shifted to left, attenuate right */
+ t->rr = (32768 - ctrl->value)/1057;
+ t->rf = t->rr;
+ t->lr = TDA7432_ATTEN_0DB;
+ t->lf = TDA7432_ATTEN_0DB;
+ } else if(ctrl->value > 32769) {
+ /* shifted to right, attenuate left */
+ t->lf = (ctrl->value - 32768)/1057;
+ t->lr = t->lf;
+ t->rr = TDA7432_ATTEN_0DB;
+ t->rf = TDA7432_ATTEN_0DB;
+ } else {
+ /* centered */
+ t->rr = TDA7432_ATTEN_0DB;
+ t->rf = TDA7432_ATTEN_0DB;
+ t->lf = TDA7432_ATTEN_0DB;
+ t->lr = TDA7432_ATTEN_0DB;
+ }
+ break;
+ case V4L2_CID_AUDIO_BASS:
+ t->bass = ctrl->value >> 12;
+ if(t->bass>= 0x8)
+ t->bass = (~t->bass & 0xf) + 0x8 ;
+
+ tda7432_write(sd, TDA7432_TN, 0x10 | (t->bass << 4) | t->treble);
+ return 0;
+ case V4L2_CID_AUDIO_TREBLE:
+ t->treble= ctrl->value >> 12;
+ if(t->treble>= 0x8)
+ t->treble = (~t->treble & 0xf) + 0x8 ;
+
+ tda7432_write(sd, TDA7432_TN, 0x10 | (t->bass << 4) | t->treble);
+ return 0;
+ default:
+ return -EINVAL;
+ }
+
+ /* Used for both mute and balance changes */
+ if (t->muted)
+ {
+ /* Mute & update balance*/
+ tda7432_write(sd, TDA7432_LF, t->lf | TDA7432_MUTE);
+ tda7432_write(sd, TDA7432_LR, t->lr | TDA7432_MUTE);
+ tda7432_write(sd, TDA7432_RF, t->rf | TDA7432_MUTE);
+ tda7432_write(sd, TDA7432_RR, t->rr | TDA7432_MUTE);
+ } else {
+ tda7432_write(sd, TDA7432_LF, t->lf);
+ tda7432_write(sd, TDA7432_LR, t->lr);
+ tda7432_write(sd, TDA7432_RF, t->rf);
+ tda7432_write(sd, TDA7432_RR, t->rr);
+ }
+ return 0;
+}
+
+static int tda7432_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
+{
+ switch (qc->id) {
+ case V4L2_CID_AUDIO_VOLUME:
+ return v4l2_ctrl_query_fill(qc, 0, 65535, 65535 / 100, 58880);
+ case V4L2_CID_AUDIO_MUTE:
+ return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
+ case V4L2_CID_AUDIO_BALANCE:
+ case V4L2_CID_AUDIO_BASS:
+ case V4L2_CID_AUDIO_TREBLE:
+ return v4l2_ctrl_query_fill(qc, 0, 65535, 65535 / 100, 32768);
+ }
+ return -EINVAL;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_subdev_core_ops tda7432_core_ops = {
+ .queryctrl = tda7432_queryctrl,
+ .g_ctrl = tda7432_g_ctrl,
+ .s_ctrl = tda7432_s_ctrl,
+};
+
+static const struct v4l2_subdev_ops tda7432_ops = {
+ .core = &tda7432_core_ops,
+};
+
+/* ----------------------------------------------------------------------- */
+
+/* *********************** *
+ * i2c interface functions *
+ * *********************** */
+
+static int tda7432_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tda7432 *t;
+ struct v4l2_subdev *sd;
+
+ v4l_info(client, "chip found @ 0x%02x (%s)\n",
+ client->addr << 1, client->adapter->name);
+
+ t = kzalloc(sizeof(*t), GFP_KERNEL);
+ if (!t)
+ return -ENOMEM;
+ sd = &t->sd;
+ v4l2_i2c_subdev_init(sd, client, &tda7432_ops);
+ if (loudness < 0 || loudness > 15) {
+ v4l2_warn(sd, "loudness parameter must be between 0 and 15\n");
+ if (loudness < 0)
+ loudness = 0;
+ if (loudness > 15)
+ loudness = 15;
+ }
+
+ do_tda7432_init(sd);
+ return 0;
+}
+
+static int tda7432_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+ do_tda7432_init(sd);
+ v4l2_device_unregister_subdev(sd);
+ kfree(to_state(sd));
+ return 0;
+}
+
+static const struct i2c_device_id tda7432_id[] = {
+ { "tda7432", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tda7432_id);
+
+static struct i2c_driver tda7432_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "tda7432",
+ },
+ .probe = tda7432_probe,
+ .remove = tda7432_remove,
+ .id_table = tda7432_id,
+};
+
+module_i2c_driver(tda7432_driver);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.